Process for reducing non-uniformities in the density of...

Details Process for reducing non-uniformities in the density of... Process for reducing non-uniformities in the density of...

2006-07-28

2009-06-16

Griffin, Steven P (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

C264S654000, C264S603000

Reexamination Certificate

active

07547408

ABSTRACT:
There is disclosed a pre-sintering process for reducing non-uniformities in the density of a sintered material comprising (a) providing a mixture of (i) a first sinterable material containing a contaminant the presence of which during sintering of the first sinterable material results in a higher vapor pressure than would occur during sintering of pure first sinterable material and (ii) a second material having a higher affinity for the contaminant than does the first sinterable material; and (b) heating the mixture at a temperature and for a time sufficient to allow the second material to at least partly mitigate the propensity of the contaminant to raise the vapor pressure during the sintering of the first sinterable material. Other embodiments are also disclosed.

REFERENCES:
patent: 2834651 (1958-05-01), Gray
patent: 4118450 (1978-10-01), Nakamura et al.
patent: 5942099 (1999-08-01), Nitschke et al.
patent: 6309995 (2001-10-01), Maher et al.
Ness, Eric A. and Rafaniello, William, “Origin of Density Gradients in Sintered β-Silicon Carbide Parts,” Journal of the American Ceramic Society, vol. 77, No. 11, 2879-84 (1994).
Sean M. Sweeney, “Permeability, Drying, and Sintering of Pressure Filtered Ceramic Nanopowders,” Chapter 6, “Sintering Study,” pp. 135-195, Appendices G and H, pp. 284-295, Ph.D. Thesis, Graduate School, Pennsylvania State University, Dept. of Materials Science and Engineering, (May 2005).

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